Best Steam Includes Source SDK Games

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Name Release Date Current Players All-Time Peak Rating
Garry's Mod Garry's Mod 29 Nov, 2006 23 945 73 863 96.09
Left 4 Dead 2 Left 4 Dead 2 16 Nov, 2009 17 461 162 399 96.78
Counter-Strike: Source Counter-Strike: Source 1 Nov, 2004 9 224 100 056 95.06
Half-Life 2 Half-Life 2 16 Nov, 2004 2 142 64 085 96.46
Black Mesa Black Mesa 6 Mar, 2020 584 7 158 93.94
No More Room in Hell No More Room in Hell 31 Oct, 2013 551 10 922 88.53
Left 4 Dead Left 4 Dead 17 Nov, 2008 427 30 616 94.64
Portal Portal 10 Oct, 2007 400 20 672 97.19
Day of Defeat: Source Day of Defeat: Source 12 Jul, 2010 327 7 507 89.63
Half-Life 2: Deathmatch Half-Life 2: Deathmatch 1 Nov, 2004 183 2 702 88.42
Alien Swarm: Reactive Drop Alien Swarm: Reactive Drop 20 Apr, 2017 179 9 335 92.73
Astro Colony Astro Colony 7 Nov, 2022 127 2 751 78.95
Entropy : Zero 2 Entropy : Zero 2 20 Aug, 2022 114 3 751
Menace from the Deep Menace from the Deep 2024 97 1 653 81.18
Synergy Synergy 3 Oct, 2008 94 2 940 88.30
Fistful of Frags Fistful of Frags 9 May, 2014 83 3 537 89.60
Pool Nation FX Lite Pool Nation FX Lite 7 Dec, 2015 81 1 271 70.37
Pirates, Vikings, and Knights II Pirates, Vikings, and Knights II 12 Feb, 2010 54 878 84.96
Treason Treason 31 Jan, 2023 54 226
Half-Life 2 RTX Half-Life 2 RTX Coming soon 48 3 802
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